Torque- Too Tight?

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Old 10-08-14, 06:54 PM
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Torque- Too Tight?

I was working in my panel and got to thinking afterwards "how tight is too tight?"... I gave the neutrals and the breakers screws pretty significant torque. (I don't have a torque screwdriver?)

So essentially what I am asking, what could go wrong when its too tight? How tight is enough in panels? What do you think?
 
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Old 10-08-14, 07:05 PM
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Too tight can create hot spots and also can cut through the conductor. If you checked the torque I would bet you are way too tight.
 
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Old 10-09-14, 06:36 AM
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Trying to make it too tight will strip the threads, particularly in breaker terminals and switch/receptacle terminals. After that the connection will be forever too loose and you must replace the component whose terminal got stripped.

It's hard to describe in words how tight to make it without a torque driver or wrench. I am guessing that tightening it snug so the wire cannot wiggle (or forcibly wiggling the wire doesn't loosen the screw) and then add a quarter turn should be adequate.
 
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Old 10-09-14, 07:18 AM
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Torque

Panel should have torqueing values listed for the various connections in the panel. You need to use a calibrated torque wrench or screw driver to insure proper torque.
 
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Old 10-09-14, 08:17 AM
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Panel should have torqueing values listed for the various connections in the panel. You need to use a calibrated torque wrench or screw driver to insure proper torque.
Lets take a poll... how many electricians have a torque screwdriver on a service call? Or better yet, how many Do It Yerselfers own a torque driver?
 
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Old 10-09-14, 08:37 AM
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I vote no calibration. Snug it up and pull on wire a little to make sure it's secure.
It's not going anywhere.

Reminds me of plumbing connections. You don't need a torque wrench to connect a P-Trap. Snug/hand tighten and you're good.
 
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Old 10-09-14, 02:43 PM
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Torque

It might help to read the NEC.
 
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Old 10-09-14, 02:53 PM
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OK,
I guess I change my vote!

Thanks
 
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Old 10-09-14, 05:50 PM
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Copper is pretty forgiving when it comes to tightening terminals.
Aluminum is the material that needs to be handled with care. Aluminum wiring is very easily flattened and damaged by over tightening.
 
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Old 10-10-14, 05:55 AM
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Torque



It might help to read the NEC.

I think this might be a jab at me. Well WIREPULLER, I have been reading and following the NEC for 42 years as a practicing electrician. I know full well about torque values and I don't appreciate you suggesting I am not compliant.

With that said, Wirepuller my question remains.... how many electricians or DIY'ers have a torque screwdriver? Do you own a properly calibrated torque screwdriver Wirepuller?
 
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Old 10-10-14, 06:49 AM
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Torque

Do you own a properly calibrated torque screwdriver Wirepuller?
Yes.

Thank you for acknowledging that you are familiar with the NEC concerning torquing requirements. Have a nice day.
 
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Old 10-10-14, 07:36 AM
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This thread has run its course so I am closing it.
 
 

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